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Mapper 438: add reset-based Contra variant

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NewRisingSun
2025-09-30 20:32:09 +02:00
parent 76f40218d0
commit dfdbd64526
1 changed files with 47 additions and 35 deletions
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82
src/boards/438.c
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@@ -1,8 +1,7 @@
/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2012 CaH4e3
* Copyright (C) 2002 Xodnizel
* Copyright (C) 2025 NewRisingSun
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -18,50 +17,63 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* K-3071 */
#include "mapinc.h"
#include "asic_latch.h"
#include "cartram.h"
static uint8 latch[2];
static uint8 unrom;
static void Mapper438_Sync(void) {
if (latch[0] &1)
setprg32(0x8000, latch[0] >>2);
static void sync0 () {
if (Latch_address &0x01)
setprg32(0x8000, Latch_address >>2);
else {
setprg16(0x8000, latch[0] >>1);
setprg16(0xC000, latch[0] >>1);
setprg16(0x8000, Latch_address >>1);
setprg16(0xC000, Latch_address >>1);
}
setchr8(latch[1] >>1);
setmirror(latch[1] &1 ^1);
setchr8(Latch_data >>1);
setmirror(Latch_data &0x01? MI_H: MI_V);
}
static DECLFW(Mapper438_WriteLatch) {
latch[0] =A &0xFF;
latch[1] =V;
Mapper438_Sync();
static void sync1 () {
int mask = ROM_size -9;
if (unrom) {
mask++;
setprg16(0x8000, Latch_data &7 | mask);
setprg16(0xC000, 7 | mask);
setchr8r(0x10, 0);
setmirror(MI_V);
} else {
if (Latch_address &0x01)
setprg32(0x8000, Latch_address >>2 &(mask >>1));
else {
setprg16(0x8000, Latch_address >>1 &mask);
setprg16(0xC000, Latch_address >>1 &mask);
}
setchr8(Latch_data >>1);
setmirror(Latch_data &0x01? MI_H: MI_V);
}
}
static void Mapper438_Reset(void) {
latch[0] =latch[1] =0;
Mapper438_Sync();
static void power () {
unrom = 0;
Latch_power();
}
static void Mapper438_Power(void) {
latch[0] =latch[1] =0;
Mapper438_Sync();
SetReadHandler(0x8000, 0xFFFF, CartBR);
SetWriteHandler(0x8000, 0xFFFF, Mapper438_WriteLatch);
static void reset () {
unrom = !unrom;
Latch_clear();
}
static void StateRestore(int version) {
Mapper438_Sync();
}
void Mapper438_Init(CartInfo *info) {
info->Reset = Mapper438_Reset;
info->Power = Mapper438_Power;
GameStateRestore = StateRestore;
AddExState(&latch, 2, 0, "LATC");
void Mapper438_Init (CartInfo *info) {
if (info->submapper == 1) {
Latch_init(info, sync1, 0x8000, 0xFFFF, NULL);
CHRRAM_init(info, 8);
info->Power = power;
info->Reset = reset;
AddExState(&unrom, 1, 0, "UNRO");
} else {
Latch_init(info, sync0, 0x8000, 0xFFFF, NULL);
info->Reset = Latch_clear;
}
}